pypa/pip — pull request #585 by qwcode (2012-06-23 15:44:17+00:00)
Title: --user fixes part 6 #573

part 6 of the --user pull series
https://gist.github.com/2822510

#573: don't --user install in --system-site-packages virtualenvs when a conflict is present in the virtualenv site.

fixing this required 2 of my previous tests to require sitecustomize.py monkey patches in the test environment to simulate the global environment.